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1986 XT600 won't run properly 1986 XT600 won't run properly
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Yamaha Tech Originally the Yamaha XT600 Tech Forum, due to demand it now includes all Yamaha's technical / mechanical / repair / preparation questions.
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  #1  
Old 30 Sep 2009
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1986 XT600 won't run properly
Hello all,

I have bought a C-reg 1986 xt600 which hasn't been running in two years. I have given it a full service, ie all filters, oil and spark plug. I stripped and cleaned the carb twice, i have checked the valve clearances too but it still won't run properly. It can be difficult to start and when it does, the revs rise and fall without me touching the throttle and when you ride it, it seems as though the engine is being starngled, ie no power and you get a popping noise from the exhaust, i think it's backfire.

Any help would be greatly appreciated.

Thanks, Neil.
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  #2  
Old 30 Sep 2009
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If the bike was left with fuel in it... The only way to clean the carbs is ultrasonically - even then its not 100% g'teed that all the passages will be cleared.
I'd be tempted to try another secondhand carb - or one off a working bike to be sure, before going off on a spending spree replacing everything!
Good luck
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  #3  
Old 30 Sep 2009
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had same problem with my 83 xt 550 take carb apert stick drill bit or somthing like that and clean out all holes jets everything u can stick it down make sure u can spray carb cleaner threw all hoses jets everything problem on mine was bottom hole cloged joining two carbs unplugged it bike ran fine had carb off three times till i finally noticed this
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  #4  
Old 1 Oct 2009
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ok, cheers for the suggestions. So you both seem to think, like I do, that it is just a dirty carb problem rather than engine components failure?
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  #5  
Old 1 Oct 2009
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It sounds just like mine did before a good carb cleaning. Make sure you take off carb bowl,slip out pin that holds on floats and clean down where that little pin sits and undo jet and make sure 100% clean.
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  #6  
Old 1 Oct 2009
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I have had the floats off and the jets out??? I am worried now cos I have tried all of these things and it still won't run
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  #7  
Old 1 Oct 2009
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Trouble wiv carbs is the really fine passages are usually tucked away (can't see 'em) and they're the ones that get blocked, so you can't poke 'em clear!
Ultrasonic or lots of soaking/blowing & patience.
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  #8  
Old 1 Oct 2009
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Also, check for airleaks on both sides of the carb.
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  #9  
Old 2 Oct 2009
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I wondered about air leaks to. I have replaced the carb to cyl head rubbers and made sure the air intake pipes are tightened nicely. I was thinking of getting a repair/overhaul kit for the carb.
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  #10  
Old 12 Oct 2009
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hey prob 2 late saying this,has that year got a fuel pump/regulator? cause mine tends to backfire/run bit rough i originally thought the carbs were wrong but discovered someone bypassed my fuel p/r and think thats the prob,maybe your's acting up?sorry i'm so late with this ya've prob got it sorted already.
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  #11  
Old 5 Dec 2009
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http://www.horizonsunlimited.com/hub...wont-run-46925

Check this out, it's another thread I started. I don't have a fuel pump on my bike. Should I have a fuel pump? It's fed straight from the tank to the carb.
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